Piezoelectric resonators.

摘要

A piezoelectric resonator which resonates in a thickness shear mode comprises a strip shaped resonance chip (3) made of an X-cut plate of lithium tantalate crystal and having a rectangular cross-section. Electrodes (4,4) are formed at a center portion with respect to the longitudinal direction of the resonance chip on each of its two X-plane surfaces. The width of the electrodes is equal to the width of the resonance chip. The longitudinal direction of the resonance chip is inclined with respect to the Y-axis by an angle of -50°±2° (in the anticlockwise direction) in the X-plane so as to make the longitudinal direction of the resonance chip coincide with the displacement direction of primary oscillation of the crystal.